There's no miracle, it works with the larger jar file because it must include the catalog items needed in the applet, while the catalog of Sweet Home 3D Online applet references only models and textures stored on sweethome3d.com. This doesn't change that much the total amount of downloaded info, but a smaller initial download will help to start the applet faster.
As I don't know how you built your file, it's difficult to help you.
In case you didn't notice, the following threads may help you:
- Deploying SweetHome3D, to be embeded in webpage
- How to import furniture in Applet.
Studying the applet target in Ant build.xml might help you too.
By the way, it would be nice to explain why you're trying to create an online version.
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Emmanuel Puybaret, Sweet Home 3D creator
